DOI: 10.1175/JCLI-D-16-0100.1
Scopus记录号: 2-s2.0-85008179599
论文题名: The resolution sensitivity of Northern Hemisphere blocking in four 25-km atmospheric global circulation models
作者: Schiemann R. ; Demory M.-E. ; Shaffrey L.C. ; Strachana J. ; Vidale P.L. ; Mizielinski M.S. ; Roberts M.J. ; Wehner M.F. ; Jung T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 1 起始页码: 337
结束页码: 358
语种: 英语
Scopus关键词: Climate change
; Climatology
; Blocking
; Climate variability
; Ensembles
; Model evaluation/performance
; Reanalysis
; Climate models
英文摘要: The aim of this study is to investigate if the representation of Northern Hemisphere blocking is sensitive to resolution in current-generation atmospheric global circulation models (AGCMs). An evaluation is conducted of how well atmospheric blocking is represented in four AGCMs whose horizontal resolution is increased from a grid spacing of more than 100 km to about 25 km. It is shown that Euro-Atlantic blocking is simulated overall more credibly at higher resolution (i.e., in better agreement with a 50-yr reference blocking climatology created from the reanalyses ERA-40 and ERA-Interim). The improvement seen with resolution depends on the season and to some extent on the model considered. Euro-Atlantic blocking is simulated more realistically at higher resolution in winter, spring, and autumn, and robustly so across the model ensemble. The improvement in spring is larger than that in winter and autumn. Summer blocking is found to be better simulated at higher resolution by one model only, with little change seen in the other three models. The representation of Pacific blocking is not found to systematically depend on resolution. Despite the improvements seen with resolution, the 25-km models still exhibit large biases in Euro-Atlantic blocking. For example, three of the four 25-km models underestimate winter northern European blocking frequency by about one-third. The resolution sensitivity and biases in the simulated blocking are shown to be in part associated with the mean-state biases in the models' midlatitude circulation. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49894
Appears in Collections: 气候变化事实与影响
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作者单位: National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom; Met Office Hadley Centre, Exeter, United Kingdom Mio Matsueda Center for Computational Sciences, University of Tsukuba, Tsukuba, Japan; Department of Physics, University of Oxford, Oxford, United Kingdom; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom; Alfred Wegener Institute, Bremerhaven, Germany
Recommended Citation:
Schiemann R.,Demory M.-E.,Shaffrey L.C.,et al. The resolution sensitivity of Northern Hemisphere blocking in four 25-km atmospheric global circulation models[J]. Journal of Climate,2017-01-01,30(1)